$\begingroup$What you wrote works in chat but not in comments (on main and meta). Some basic information on notification in comments is linked in comment-notification tag-info. You can find there link to How do comment @replies work?, which also contains section "Can I notify more than one person at a time?" with more detailed information.$\endgroup$
– Martin SleziakAug 16 '17 at 18:33

1 Answer
1

In general, you can't. However, the author of the post will automatically receive inbox notification without the @name syntax. If user A is the author, and you want to reach user B as well (someone who has participated in the thread, via edit or comment), then by typing @B, both A and B will be notified. But if B has not participated in the post discussion, then B cannot be reached this way.

Most of the ins and outs of notification by comment, including which notifications are automatic without the @name mechanism, are explained here. There is some extra clarification here.

$\begingroup$@Martin Dear Todd and Martin I thank you so much for your kindly answer and comment.$\endgroup$
– Ali TaghaviAug 16 '17 at 18:45

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$\begingroup$@AliTaghavi That doesn't work, because Martin did not participate on the comments for this answer, did not author the answer, did not edit the answer, and did not post the question.$\endgroup$
– Andrés E. CaicedoAug 18 '17 at 3:22